Pump with a pressure driving head

ABSTRACT

A pump with a pressure driving head comprises a retaining tube; the retaining tube having a receiving space; liquid can flow therein; a returning element being installed in the receiving space; a movable tube received in the receiving space of the retaining tube; a head extending from a top of the movable tube; the head having an outlet which is communicated to the movable tube; when a pressure is applied to the head, the movable tube will move axially in the retaining tube; and an isolation device tightly adhered upon an inner wall of the receiving space of the retaining tube; an air isolation chamber being formed by the isolation device and the movable tube; with the pressing affect of the movable tube, a part of liquid in the retaining tube will be stored in the air isolation chamber so as to be formed with an air isolation layer.

FIELD OF THE INVENTION

The present invention relates to cleaning agents, and particularly to a pump with a pressure driving head, wherein the defects about the wearing and air ventilation of the inner wall by particle or emulsion like materials are improved.

BACKGROUND OF THE INVENTION

Generally, the cleaning agent bottle has a pressable head at a top of the bottle for sucking liquid in the container. Thus it is unnecessary to open or close a cover in use. Thereby the user can get the cleaning agent by pressing the head.

In one prior art, a pressable head is assembled to an opening of a container. An inner tube of the pressable head will be driven with the pressing of the head. A bottom of the inner tube is installed with a plug and an elastic element. When the inner tube is pressed, the liquid in the container will be sucked out from the container. When the head is released, the head will return to the original position by the resilient force of the elastic element so as to such the liquid in the container repeatedly.

However, although the prior art structure has the effect of sucking liquid in the container, when the object in the container is not a complete liquid, such as particle like structure or emulsion, etc., they will wear an inner wall of the container. As a result, gaps are formed and thus the pumping effect by pressing the head is reduced. As a whole, the prior art structure is not a prefect one and necessary to be improved.

SUMMARY OF THE INVENTION

Accordingly, the primary object of the present invention is to provide a pump with a pressure driving head, wherein the defects about the wearing and air ventilation of the inner wall by particle or emulsion like materials are improved.

To achieve above objects, the present invention provides a pump with a pressure driving head which comprises a retaining tube has two open ends; the retaining tube having a receiving space; liquid can flow in the receiving space; a returning element being installed in the receiving space; a movable tube received in the receiving space of the retaining tube; a head extending from a top of the movable tube; the head having an outlet which is communicated to the movable tube; when a pressure is applied to the head, the movable tube will move axially in the retaining tube; and an isolation device tightly adhered upon an inner wall of the receiving space of the retaining tube; an air isolation chamber being formed by the isolation device and the movable tube; with the pressing affect of the movable tube, a part of liquid in the retaining tube will be stored in the air isolation chamber so as to be formed with an air isolation layer.

The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view showing the pump with a pressure driving head of the present invention.

FIG. 2 is a schematic cross sectional view of the pump with a pressure driving head of the present invention.

FIG. 3 is an exploded perspective view about the air isolation structure of the pump with a pressure driving head of the present invention.

FIG. 4 is a perspective view about the air isolation structure of the pump with a pressure driving head of the present invention.

FIG. 5 is a schematic cross sectional view along line A-A of FIG. 4.

FIG. 6 is a schematic cross sectional view showing the check valve is opened according to the FIG. 5.

FIG. 7 is a schematic cross sectional view along line B-B of FIG. 4.

FIG. 8 is a schematic cross sectional view showing the check valve in FIG. 7 being opened.

FIG. 9 is a schematic cross sectional view showing the use of the pump with a pressure driving head of the present invention.

FIG. 10 is a schematic view showing the check valve of the pump with a pressure driving head of the present invention being opened.

DETAILED DESCRIPTION OF THE INVENTION

In order that those skilled in the art can further understand the present invention, a description will be provided in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.

Referring to FIGS. 1 and 2, the pump of the present invention is illustrated. The body 1 of the present invention has a retaining tube 10, a movable tube 20 and an isolation device 30. When the user presses the body 1, the movable tube 20 moves in the retaining tube 10 so as to change the pressure of fluid so as to suck the liquid in the container. The structure is known in the prior art and thus the details will not be further described herein.

The retaining tube 10 has two open ends. A cover 11 encloses the retaining tube 10. The cover 11 can lock upon an opening of a container 40. Liquid is contained in the container 40. The retaining tube 10 has a receiving space 12. The liquid can flow in the receiving space 12. A returning element 13 is installed in the receiving space 12. In this embodiment, the returning element 13 is a spring.

The movable tube 20 is received in the receiving space 12 of the retaining tube 10. A head 21 is extended from one side of a top of the movable tube 20. The head 21 has an outlet 211 which is communicated to the movable tube 20. When a user presses the head 21, the movable tube 20 will move axially in the retaining tube 10. When the user releases the head 21, the movable tube 20 will eject by the elastic force of the returning element 13 to return to the original position.

Referring to FIGS. 3 to 8, the isolation device 30 includes a piston sheet 31 and a check valve 32. The piston sheet 31 of the isolation device 30 is tightly adhered upon an inner wall of the receiving space 12 of the retaining tube 10 so as to be combined to a lower end of the movable tube 20. Thereby an air isolation chamber 33 is formed by the piston sheet 31 of the isolation device 30 and the movable tube 20. The piston sheet 31 has at least one via hole 311 and a positioning hole 312. The via hole 311 is communicated to the air isolation chamber 33. Two ends of the via hole 311 have larger diameters than that of the middle portion thereof. The check valve 32 is positioned in the positioning hole 312. The check valve 32 has an inclined plug 321 having a shape corresponding to the shape of the via hole 311 and a positioning rod 322 having a shape corresponding to that of the positioning hole 312. The plug 32 of the check valve 32 provides a unidirectional isolation function to the air isolation chamber 33. Thus liquid can be filled thereinto and be stored in the air isolation chamber 33. The configuration of the via hole 311 has the function of providing the liquid to flow into the receiving space so as to form a layer for isolating air. The positioning rod 322 can be inserted into the positioning hole 312 so that the check valve 32 opens and closes along a predetermined path. The configuration of the via hole 311 and plug 321 are not confined to that disclosed in FIGS. 3 and 4. Other configurations are also permissible.

Referring to FIGS. 9 and 10, when the user presses the head 21, the liquid therein will be sucked upwards and then the plug 321 sealing the via hole 311 will also move upwards. Then the via hole 311 is opened. Thus, the liquid flows into the air isolation chamber 33 from the via hole 311, and the check valve 32 closes when the suction pressure disappear so that the liquid is stored in the air isolation chamber 33 to be formed as an airtight isolation layer. The isolation device 30 isolates the receiving space 12 of the retaining tube 10 into two portions. Thus, in the pressing process, the liquid can filling the gap at the inner wall of the movable tube 20 so as to have the function of providing the movable tube 20 to move reciprocally. Thus, the liquid in the container can be sucked completely with the movable tube 20.

When the liquid in the air isolation chamber 33 is formed as an isolation layer, as the user further presses the head 21, the movable tube 20 will suck the liquid in the container. The liquid flows from the bottom of the receiving space 12 to the movable tube 20 and then is released from the outlet 211 of the head 21. Thus the air isolation layer has the effect of preventing air to release out. Therefore, the released liquid during the process of pressing the head 21 is retained.

The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. 

What is claimed is:
 1. A pump with a pressure driving head, comprising; a retaining tube having two open ends; the retaining tube having a receiving space; liquid can flow in the receiving space; a returning element being installed in the receiving space; a movable tube received in the receiving space of the retaining tube; a head extending from a top of the movable tube; the head having an outlet which is communicated to the movable tube; when a pressure is applied to the head, the movable tube will move axially in the retaining tube; an isolation device tightly adhered upon an inner wall of the receiving space of the retaining tube; an air isolation chamber being formed by the isolation device and the movable tube; with the pressing affect of the movable tube, a part of liquid in the retaining tube will be stored in the air isolation chamber so as to be formed with an air isolation layer.
 2. The pump with a pressure driving head as claimed in claim 1, wherein the isolation device is formed with at least one via hole which is communicated with the air isolation chamber; a check valve is installed in the via hole so that the air isolation chamber has the effect of controlling the liquid to flow uni-directionally.
 3. The pump with a pressure driving head as claimed in claim 2, wherein the via hole is inserted with a plug which has a shape corresponding to that of the via hole.
 4. The pump with a pressure driving head as claimed in claim 1, wherein the check valve is installed with a positioning rod, and the isolation device is installed with a positioning hole.
 5. The pump with a pressure driving head as claimed in claim 1, wherein two ends of the via hole have larger diameters than that of the middle portion thereof.
 6. The pump with a pressure driving head as claimed in claim 1, wherein the returning element is a spring.
 7. The pump with a pressure driving head as claimed in claim 1, wherein a cover is installed at a periphery of the movable tube, which can be assembled to a container. 